CN108696177A - A kind of light-weighted method of realization ultrasound electric machine - Google Patents
A kind of light-weighted method of realization ultrasound electric machine Download PDFInfo
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- CN108696177A CN108696177A CN201810708791.1A CN201810708791A CN108696177A CN 108696177 A CN108696177 A CN 108696177A CN 201810708791 A CN201810708791 A CN 201810708791A CN 108696177 A CN108696177 A CN 108696177A
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- stator
- electric machine
- fiber
- ultrasound electric
- polymer composites
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- 238000002604 ultrasonography Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 25
- 229910000906 Bronze Inorganic materials 0.000 claims abstract description 23
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000010974 bronze Substances 0.000 claims abstract description 23
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920000642 polymer Polymers 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 4
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 22
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 18
- 229920006231 aramid fiber Polymers 0.000 claims description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 13
- 239000004917 carbon fiber Substances 0.000 claims description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 9
- 238000000748 compression moulding Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 239000003365 glass fiber Substances 0.000 claims description 8
- 238000007731 hot pressing Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 8
- 229920006351 engineering plastic Polymers 0.000 claims description 7
- -1 polyparaphenylene Polymers 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229920000265 Polyparaphenylene Polymers 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 229920002492 poly(sulfone) Polymers 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 229920006324 polyoxymethylene Polymers 0.000 claims description 4
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 3
- 229920002530 polyetherether ketone Polymers 0.000 claims description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 2
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 229920006389 polyphenyl polymer Polymers 0.000 description 12
- 150000003568 thioethers Chemical class 0.000 description 12
- 208000020442 loss of weight Diseases 0.000 description 7
- 230000002708 enhancing effect Effects 0.000 description 6
- 239000011152 fibreglass Substances 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 208000016261 weight loss Diseases 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/005—Mechanical details, e.g. housings
- H02N2/0065—Friction interface
- H02N2/007—Materials
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/22—Methods relating to manufacturing, e.g. assembling, calibration
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Manufacture Of Motors, Generators (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A kind of light-weighted method of realization ultrasound electric machine, it is characterized in that replacing phosphor bronze ultrasonic motor stator, rotor that aluminum alloy surface is still used to paste PTFE base friction layer material using the ultrasonic motor stator of polymer composites manufacture;The present invention is while ensureing requirement of the ultrasound electric machine to stator material, it disclosure satisfy that the requirement of rotor frictional behavior, when stator quality is reduced 80-85%, still the machinery with relatively high power exports, to reduce motor total quality, important technology is provided for the lightweights application field such as aerospace.
Description
Technical field
The present invention relates to a kind of Ultrasonic Motor Techniques, especially a kind of ultrasound electric machine Technology of Weight Reduction is specifically a kind of
Realize the light-weighted method of ultrasound electric machine.
Background technology
Ultrasound electric machine is a kind of novel small and special electric machine for rapidly developing and having special applications the 1980s, is to utilize
The microscopic vibration of elastomeric stator is converted into the macroscopic motion of rotor by inverse piezoelectric effect by friction, simple in structure, can be designed
Property it is strong, wherein core component be stator and rotor, but to its intensity, elasticity modulus, density, wearability, thermal conductivity etc. have
There are strict requirements.At present using more stator material be phosphor bronze, because its with good wear-resistant, elastic, thermal conductivity,
Antifatigue equal excellent properties.Rotor is that aluminum alloy material surface pastes PTFE base friction material, has light weight, Yi Jia
The advantages such as work, of low cost.
The density of stator phosphor bronze material is maximum in ultrasound electric machine(8.8g/cm3), account for the 20% of entire motor quality with
On, there is extensive development space in its lightweight application field.So being reduced instead of phosphor bronze stator by light material
Motor quality is particularly important, and so far, is also found no and is closed the light-weighted design of ultrasound electric machine and correlative study.This hair
It is bright according to ultrasound electric machine to the particular/special requirement of elastomeric stator performance, intend selecting density smaller and with higher mechanical strength, resistance to
It grinds and is replaced with the polymer of excellent thermal conductivity, to reduce motor total quality.Preferably, polyphenylene sulfide is a kind of novel
High performance plastic resin, with high mechanical strength, high temperature resistant, chemical resistance, fire-retardant, thermal stability is good, electrical property is excellent
The advantages that good, can substantially reduce motor by that can become the ideal alternative materials of motor phosphor bronze stator after fiber reinforcement
Total quality.
Invention content
It is difficult the purpose of the present invention is for the phosphor bronze stator largely used in existing ultrasound electric machine, that there are weight is excessive
To realize the light-weighted problem of complete machine, invention is a kind of to substitute and mitigates the reality of main screw lift using polymer composites stator
The light-weighted method of existing ultrasound electric machine.
One of technical scheme of the present invention is:
A kind of light-weighted method of realization ultrasound electric machine, it is characterized in that the ultrasonic motor stator manufactured using polymer composites
Instead of phosphor bronze ultrasonic motor stator, rotor still uses aluminum alloy surface to paste PTFE base friction layer material;Entirely
The weight of stator mitigates 80-85% or more on year-on-year basis.
The polymer composites are fibre-reinforced engineering plastics, and the adding proportion of the fiber is 15-30
vol.%。
The engineering plastics are with high mechanical strength, high temperature resistant, anti abrasive polyphenylene sulfide, polyimides, gather
Ether ether ketone, phenolic resin, polyparaphenylene, polysulfones or polyformaldehyde.
The preferred polyphenylene sulfide of the polymer, polyphenylene sulfide Moulding powder average grain diameter are 75 μm.
The fiber is chopped carbon fiber, glass fibre or aramid fiber.
7 μm of the carbon fiber diameter, 20-50 μm of length, 7 μm of glass fiber diameter, 20-50 μm of length, aramid fiber
A diameter of 7 μm.Length range is 20-50 μm.
Technical scheme of the present invention second is that:
A kind of manufacturing method of polymer composites ultrasonic motor stator, it is characterized in that fiber and engineering plastics Moulding powder are pressed
Composite powder is handled 2h in 100 DEG C of baking ovens before hot pressing, is then freely sintered to by volume ratio compression molding after mixing
370 DEG C of heat preservation half an hour, start to pressurize when being cooled to 240 DEG C, pressurize half an hour when pressure rises to 20MPa, last natural cooling
Fiber reinforced polymer composites blank is obtained, then blank is processed into ultrasonic motor stator.
Beneficial effects of the present invention:
(1), the present invention replaces ultrasound electric machine phosphor bronze stator material using fiber reinforcement polyphenyl thioether composite material, can be significantly
Reduce the total quality of motor.
(2), the composite material can utilize chopped strand to enhance, and designability is strong, and preparation process is simple and convenient, Yi Jia
Work, it is of low cost.
(3)The present invention can loss of weight 80-85% under the premise of motor load is constant.
The present invention disclosure satisfy that rotor frictional behavior while ensureing requirement of the ultrasound electric machine to stator material
It is required that still the machinery with relatively high power exports when stator quality is reduced 80-85%, to reduce motor total quality, it is
The lightweights application field such as aerospace provides important technology.
Specific implementation mode
With reference to embodiment, the present invention is further illustrated.
Embodiment 1.
The manufacturing method of carbon fiber enhanced polyphenylene sulfide composite material stator is:
By about 7 μm of diameter, the polyphenylene sulfide Moulding powder that the carbon fiber that about 20-50 μm of length is 75 μm with average grain diameter is by volume
(Wherein carbon fiber adding proportion is 15%), compression molding after mixing, before hot pressing by composite powder in 100 DEG C of baking ovens
2h is managed, 370 DEG C of heat preservation half an hour is then freely sintered to, starts to pressurize when being cooled to 240 DEG C, pressurize when pressure rises to 20MPa
Half an hour, last natural cooling obtain carbon fiber enhanced polyphenylene sulfide composite material blank, using being machined into and ultrasonic electric
The identical polymer composites stator of machine phosphor bronze stator dimensions.
By taking TRUM-60 type motors as an example, rotor outer diameter is 60mm, utilizes fibre reinforced polyphenylene sulfide composite wood
Material is used as motor stator material, stator quality 9.41g, opposite phosphor bronze stator loss of weight 83.8%, motor load 0.1N m
When still with 30r/min machinery output.
Embodiment 2.
The manufacturing method of carbon fiber enhanced polyphenylene sulfide composite material stator is:
By about 7 μm of diameter, the polyphenylene sulfide Moulding powder that the carbon fiber that about 20-50 μm of length is 75 μm with average grain diameter is by volume
(Wherein carbon fiber adding proportion is 30%), compression molding after mixing, before hot pressing by composite powder in 100 DEG C of baking ovens
2h is managed, 370 DEG C of heat preservation half an hour is then freely sintered to, starts to pressurize when being cooled to 240 DEG C, pressurize when pressure rises to 20MPa
Half an hour, last natural cooling obtain carbon fiber enhanced polyphenylene sulfide composite material blank, using being machined into and ultrasonic electric
The identical polymer composites stator of machine phosphor bronze stator dimensions.By taking TRUM-60 type motors as an example, rotor outer diameter is
60mm, using carbon fiber enhanced polyphenylene sulfide composite material as motor stator material, stator quality 9.85g, opposite phosphorus
Bronze stator loss of weight 83.05%, the still machinery output with 35r/min when motor load 0.1N m.
Embodiment 3.
The manufacturing method of fiberglass enhanced polyphenyl thioether composite material stator is:
By about 7 μm of diameter, the glass fibre that about 20-50 μm of length presses volume with average grain diameter for 75 μm of polyphenylene sulfide Moulding powder
Than(Wherein glass fibre adding proportion is 20%)Compression molding after mixing, before hot pressing by composite powder in 100 DEG C of baking ovens
2h is handled, 370 DEG C of heat preservation half an hour is then freely sintered to, starts to pressurize when being cooled to 240 DEG C, pressure is protected when rising to 20MPa
Half an hour is pressed, last natural cooling obtains fiberglass enhanced polyphenyl thioether composite material blank, using being machined into and surpass
The identical polymer composites stator of acoustic-electric machine phosphor bronze stator dimensions.
By taking TRUM-60 type motors as an example, rotor outer diameter is 60mm, compound using fiberglass enhanced polyphenyl thioether
Material as motor stator material, stator quality 10.14g, opposite phosphor bronze stator loss of weight 82.53%, the motor load
The still machinery output with 27r/min when 0.1N m.
Embodiment 4.
The manufacturing method of fiberglass enhanced polyphenyl thioether composite material stator is:
By about 7 μm of diameter, the glass fibre that about 20-50 μm of length presses volume with average grain diameter for 75 μm of polyphenylene sulfide Moulding powder
Than(Wherein glass fibre adding proportion is 25%)Compression molding after mixing, before hot pressing by composite powder in 100 DEG C of baking ovens
2h is handled, 370 DEG C of heat preservation half an hour is then freely sintered to, starts to pressurize when being cooled to 240 DEG C, pressure is protected when rising to 20MPa
Half an hour is pressed, last natural cooling obtains fiberglass enhanced polyphenyl thioether composite material blank, using being machined into and surpass
The identical polymer composites stator of acoustic-electric machine phosphor bronze stator dimensions.
By taking TRUM-60 type motors as an example, rotor outer diameter is 60mm, compound using fiberglass enhanced polyphenyl thioether
Material is as motor stator material, stator quality 11.31g, opposite phosphor bronze stator loss of weight 80.52%, the motor load
The still machinery output with 31r/min when 0.1N m.
Embodiment 5.
Aramid fiber enhancing polyphenyl thioether composite material stator manufacturing method be:
By about 7 μm of diameter, the aramid fiber that about 20-50 μm of length presses volume with average grain diameter for 75 μm of polyphenylene sulfide Moulding powder
Than(Wherein aramid fiber adding proportion is 15%)Compression molding after mixing, before hot pressing by composite powder in 100 DEG C of baking ovens
2h is handled, 370 DEG C of heat preservation half an hour is then freely sintered to, starts to pressurize when being cooled to 240 DEG C, pressure is protected when rising to 20MPa
It presses half an hour, last natural cooling obtains aramid fiber enhancing polyphenyl thioether composite material blank, using being machined into and surpass
The identical polymer composites stator of acoustic-electric machine phosphor bronze stator dimensions.
By taking TRUM-60 type motors as an example, rotor outer diameter is 60mm, compound using aramid fiber enhancing polyphenylene sulfide
Material is as motor stator material, stator quality 9.06g, opposite phosphor bronze stator loss of weight 84.39%, the motor load
The still machinery output with 26r/min when 0.1N m.
Embodiment 6.
Aramid fiber enhancing polyphenyl thioether composite material stator manufacturing method be:
By about 7 μm of diameter, the aramid fiber that about 20-50 μm of length presses volume with average grain diameter for 75 μm of polyphenylene sulfide Moulding powder
Than(Wherein aramid fiber adding proportion is 30%)Compression molding after mixing, before hot pressing by composite powder in 100 DEG C of baking ovens
2h is handled, 370 DEG C of heat preservation half an hour is then freely sintered to, starts to pressurize when being cooled to 240 DEG C, pressure is protected when rising to 20MPa
It presses half an hour, last natural cooling obtains aramid fiber enhancing polyphenyl thioether composite material blank, using being machined into and surpass
The identical polymer composites stator of acoustic-electric machine phosphor bronze stator dimensions.
By taking TRUM-60 type motors as an example, rotor outer diameter is 60mm, compound using aramid fiber enhancing polyphenylene sulfide
Material is as motor stator material, stator quality 9.15g, opposite phosphor bronze stator loss of weight 84.24%, the motor load
The still machinery output with 28r/min when 0.1N m.
Embodiment 7.
The present embodiment and embodiment one to six difference lies in used engineering plastics be polyimides, polyether-ether-ketone,
Phenolic resin, except one kind in the other polyparaphenylenes, polysulfones or polyformaldehyde of polyphenylene sulfide, corresponding Fabrication parameter(Including drying
Dry temperature, sintering temperature, pressure initial temperature, pressure etc.)Can refer to polyphenylene sulfide use parameter, also can refer to it is existing or
Relevant Materials Handbook executes.
The above is only preferably a kind of polyphenyl thioether composite material of the invention to replace phosphor bronze material, can reduce electricity
The total quality of machine, actually also a lot of polymer composites can be used as motor stator material, such as polyimides, poly-
Ether ether ketone, phenolic resin, polyparaphenylene, polysulfones, polyformaldehyde etc., it is only different in performance, it is noted that for this technology
For the those of ordinary skill in field, several lightweight composite wood can also be selected without departing from the principle of the present invention
Expect that these selections also should be regarded as protection scope of the present invention to replace phosphor bronze.
Part that the present invention does not relate to is the same as those in the prior art or can be realized by using the prior art.
Claims (8)
1. a kind of light-weighted method of realization ultrasound electric machine, it is characterized in that fixed using the ultrasound electric machine of polymer composites manufacture
Filial generation replaces phosphor bronze ultrasonic motor stator, rotor that aluminum alloy surface is still used to paste PTFE base friction layer material;It is whole
The weight of a stator mitigates 80-85% or more on year-on-year basis.
2. according to the method described in claim 1, it is characterized in that the polymer composites are fibre-reinforced engineering plastic
The adding proportion of material, the fiber is 15-30 vol.%.
3. according to the method described in claim 2, it is characterized in that the engineering plastics are with high mechanical strength, resistance to height
Warm, anti abrasive polyphenylene sulfide, polyimides, polyether-ether-ketone, phenolic resin, polyparaphenylene, polysulfones or polyformaldehyde.
4. according to the method described in claim 3, it is characterized in that the polyphenylene sulfide Moulding powder average grain diameter is 75 μm.
5. according to the method described in claim 2, it is characterized in that the fiber is that chopped carbon fiber, glass fibre or aramid fiber are fine
Dimension.
6. according to the method described in claim 5, it is characterized in that 7 μm of the carbon fiber diameter, 20-50 μm of length, glass fibers
7 μm of diameter of dimension, 20-50 μm of length, a diameter of 7 μm of aramid fiber.
7. length range is 20-50 μm.
8. a kind of manufacturing method of the polymer composites ultrasonic motor stator of claim 1 the method, it is characterized in that will
Fiber and the compression molding after mixing by volume of engineering plastics Moulding powder, before hot pressing by composite powder in 100 DEG C of baking ovens
2h is handled, 370 DEG C of heat preservation half an hour is then freely sintered to, starts to pressurize when being cooled to 240 DEG C, pressure is protected when rising to 20MPa
Half an hour is pressed, last natural cooling obtains fiber reinforced polymer composites blank, then blank is processed into ultrasound electric machine and is determined
Son.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810708791.1A CN108696177B (en) | 2018-07-02 | 2018-07-02 | A kind of light-weighted method of realization ultrasound electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810708791.1A CN108696177B (en) | 2018-07-02 | 2018-07-02 | A kind of light-weighted method of realization ultrasound electric machine |
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| Publication Number | Publication Date |
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| CN108696177A true CN108696177A (en) | 2018-10-23 |
| CN108696177B CN108696177B (en) | 2019-11-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473865A (en) * | 2003-08-07 | 2004-02-11 | 哈尔滨工业大学 | Friction material of polytetrafluoroethylene for supersonic motor |
| CN103241989A (en) * | 2012-02-03 | 2013-08-14 | 钡泰电子陶瓷股份有限公司 | Preparation method for piezoelectric composite material and piezoelectric power generator |
| JP2015186301A (en) * | 2014-03-20 | 2015-10-22 | アルプス電気株式会社 | Polymer actuator device, electrode layer for polymer actuator device, method for manufacturing electrode layer for polymer actuator device, and method for manufacturing polymer actuator device |
| CN106972778A (en) * | 2017-05-24 | 2017-07-21 | 宁波大学 | A kind of plastics stator preparation method of lightweight ultrasound electric machine and the ultrasound electric machine |
| CN106992709A (en) * | 2017-05-24 | 2017-07-28 | 宁波大学 | A kind of ultrasound electric machine metal-plastic composite stator and preparation method |
| WO2018104244A1 (en) * | 2016-12-05 | 2018-06-14 | Chambre De Commerce Et D'industrie De Region Paris Ile De France (Esiee Paris) | Electrostatic transducer for kinetic energy harvesting or mechanical sensing |
-
2018
- 2018-07-02 CN CN201810708791.1A patent/CN108696177B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473865A (en) * | 2003-08-07 | 2004-02-11 | 哈尔滨工业大学 | Friction material of polytetrafluoroethylene for supersonic motor |
| CN103241989A (en) * | 2012-02-03 | 2013-08-14 | 钡泰电子陶瓷股份有限公司 | Preparation method for piezoelectric composite material and piezoelectric power generator |
| JP2015186301A (en) * | 2014-03-20 | 2015-10-22 | アルプス電気株式会社 | Polymer actuator device, electrode layer for polymer actuator device, method for manufacturing electrode layer for polymer actuator device, and method for manufacturing polymer actuator device |
| WO2018104244A1 (en) * | 2016-12-05 | 2018-06-14 | Chambre De Commerce Et D'industrie De Region Paris Ile De France (Esiee Paris) | Electrostatic transducer for kinetic energy harvesting or mechanical sensing |
| CN106972778A (en) * | 2017-05-24 | 2017-07-21 | 宁波大学 | A kind of plastics stator preparation method of lightweight ultrasound electric machine and the ultrasound electric machine |
| CN106992709A (en) * | 2017-05-24 | 2017-07-28 | 宁波大学 | A kind of ultrasound electric machine metal-plastic composite stator and preparation method |
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